Drill sharpener



FIG. 1 is a right side elevational view of a drill sharpener showing mynew design;

FIG. 2 is a left side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view; and

FIG. 7 is a top, front and right side perspective view thereof.

The ornamental design for a drill sharpener, as shown and described.